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<p>Hello,</p>
<p>I am using DMPlex for the mesh structure of a solid mechanics finite element code. I mainly use gmsh as input file format. When I try to read in 8-noded Quadrilaterals (Element type 16 in gmsh) DMPlex tells me that this element type is unknown. However a 9-noded Quadrilateral can be read without problem. On inspecting the plexgmsh.c source code I can see that 8-noded quadrilaterals are deactivated:</p>
<pre style="color: #000000; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;" width="80"><span style="color: #a020f0;">#if 0</span>
<a name="line146"></a>146: {20, GMSH_TRI, 2, 3, 3, 9, NULL},
<a name="line147"></a>147: {16, GMSH_QUA, 2, 2, 4, 8, NULL},<br /><br /><span style="font-family: verdana, geneva, sans-serif; font-size: 10pt;">For our application these 8-noded quadrilateral are very important. </span></pre>
<pre style="color: #000000; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;" width="80"><span style="font-family: verdana, geneva, sans-serif; font-size: 10pt;">Is there any reason why they have not been implemented/deactivated in the dmplex gmsh reader? </span><br /><br /><span style="font-family: verdana, geneva, sans-serif; font-size: 10pt;">Thank you for all the great work you are doing. PETSc is amazing. </span><br /><br /><span style="font-family: verdana, geneva, sans-serif; font-size: 10pt;">Best wishes,</span><br /><span style="font-family: verdana, geneva, sans-serif; font-size: 10pt;">Susanne Claus </span></pre>
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